<!--
  InteractiveLinearGradientBrushExample.xaml
  Enables the user to interactively configure a LinearGradientBrush.
 -->

<Page  
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="BrushesIntroduction.InteractiveLinearGradientBrushExample"
  xmlns:local="clr-namespace:BrushesIntroduction"
  WindowTitle="Interactive LinearGradientBrush Example"
  Loaded="onPageLoaded">
  <Page.Resources>

    <Style x:Key="EntryLabelStyle" TargetType="{x:Type TextBlock}">
      <Setter Property="Margin" Value="0,0,5,0" />
      <Setter Property="VerticalAlignment" Value="Center" />
      <Setter Property="HorizontalAlignment" Value="Right" />
    </Style>

    <local:EnumPossibleValuesToStringArrayConverter x:Key="EnumStringConverterResource"/>
    <local:PointToStringConverter x:Key="PointToStringConverterResource"/>
    <local:DoubleToStringConverter x:Key="DoubleToStringConverterResource"/>

  </Page.Resources>
  <DockPanel Margin="10">

    <!-- Header -->
    <Border Background="{StaticResource blueHorizontalGradientBrush}" DockPanel.Dock="Top">
      <TextBlock Style="{StaticResource MyIntroTextBlockStyle}" >
        <Bold>Interactive LinearGradientBrush Example</Bold><LineBreak />
        This example enables you to preview the effects of
        setting LinearGradientBrush properties.
      </TextBlock>
    </Border>

    <!-- Footer -->
    <Rectangle 
      DockPanel.Dock="Bottom"
      Style="{StaticResource footerRectangleStyle}"
      Fill="{StaticResource blueHorizontalGradientBrush}" />

    <Border DockPanel.Dock="Top" Margin="0,10,0,0">

      <StackPanel>
        <TextBlock Margin="0,20,0,0" Text="Brush Settings" />
        <Border Background="LightGray" Padding="10">
          <Grid>
            <Grid.ColumnDefinitions>
              <ColumnDefinition Width="Auto" />
              <ColumnDefinition Width="Auto" />
              <ColumnDefinition Width="10" />
              <ColumnDefinition Width="Auto" />
              <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
              <RowDefinition Height="Auto" />
              <RowDefinition Height="5" />
              <RowDefinition Height="Auto" />
              <RowDefinition Height="5" />
              <RowDefinition Height="Auto" />
              <RowDefinition Height="5" />
              <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>

            <!-- StartPoint -->
            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="0" Grid.Row="0" 
              Text="StartPoint:" />
            <TextBox 
              Name="StartPointTextBox"
              Grid.Column="1" Grid.Row="0"
              Text="0.0000,0.0000"
              KeyUp="onStartPointTextBoxKeyUp" />

            <!-- EndPoint -->
            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="3" Grid.Row="0" 
              Text="EndPoint:" />
            <TextBox 
              Name="EndPointTextBox"
              Grid.Column="4" Grid.Row="0"
              Text="1.0000, 1.0000"
              KeyUp="onEndPointTextBoxKeyUp"/>

            <!-- MappingMode -->
            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="0" Grid.Row="2" 
              Text="MappingMode:" />

            <ComboBox 
              Name="MappingModeComboBox"
              Grid.Column="1" Grid.Row="2"
              SelectedIndex="1"
              SelectedItem="{Binding ElementName='InteractiveLinearGradientBrush', Path='MappingMode'}"
              ItemsSource="{Binding ElementName='InteractiveLinearGradientBrush', Path='MappingMode', Converter={StaticResource EnumStringConverterResource}}"
              Padding="5"
            />

            <!-- SpreadMode -->
            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="3" Grid.Row="2" 
              Text="SpreadMode:" />

            <ComboBox 
              Grid.Column="4" Grid.Row="2"
              SelectedItem="{Binding ElementName='InteractiveLinearGradientBrush', Path='SpreadMethod'}"
              SelectedIndex="0"
              ItemsSource="{Binding ElementName='InteractiveLinearGradientBrush', Path='SpreadMethod', Converter={StaticResource EnumStringConverterResource}}"
              Padding="5"
            />

            <!-- ColorInterpolationMode -->
            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="0" Grid.Row="4" 
              Text="ColorInterpolationMode:" />

            <ComboBox 
              Grid.Column="1" Grid.Row="4"
              SelectedIndex="1"
              SelectedItem="{Binding ElementName='InteractiveLinearGradientBrush', Path='ColorInterpolationMode'}"
              ItemsSource="{Binding ElementName='InteractiveLinearGradientBrush', Path='ColorInterpolationMode', Converter={StaticResource EnumStringConverterResource}}"
              Padding="5"
            />

            <!-- Opacity -->
            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="0" Grid.Row="6" 
              Text="Opacity:" />

            <Slider 
              Grid.Column="1" Grid.Row="6"
              Grid.ColumnSpan="4"
              Minimum="0" Maximum="1" 
              Value="{Binding ElementName='InteractiveLinearGradientBrush', Path='Opacity'}" />
          </Grid>
        </Border>

        <!-- Interactive Gradient Stop Controls -->
        <TextBlock Margin="0,20,0,0" Text="Gradient Stops" />
        <Border Background="LightGray" Padding="10">
          <Grid Margin="20,0,0,0">
            <Grid.ColumnDefinitions>
              <ColumnDefinition Width="Auto" />
              <ColumnDefinition Width="Auto" />
              <ColumnDefinition Width="Auto" />
              <ColumnDefinition Width="5" />
              <ColumnDefinition Width="Auto" />
              <ColumnDefinition Width="Auto" />
              <ColumnDefinition Width="Auto" />
              <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
              <RowDefinition Height="Auto" />
              <RowDefinition Height="5" />
              <RowDefinition Height="Auto" />
              <RowDefinition Height="5" />
              <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>

            <!-- Gradient Stop 1 -->
            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="0" Grid.Row="0" 
              FontWeight="Bold"
              Margin="0,0,20,0"
              Text="Stop 1" />

            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="1" Grid.Row="0" 
              Text="Color:" />

            <TextBox
              Grid.Column="2" Grid.Row="0" 
              Text="{Binding ElementName='GradientStop1', Path='Color'}" />

            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="4" Grid.Row="0" 
              Text="Offset:" />

            <Slider
              Grid.Column="5" Grid.Row="0" 
              Minimum="0" Maximum="1" 
              Width="100" 
              Value="{Binding ElementName='GradientStop1', Path='Offset'}" />

            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="6" Grid.Row="0" 
              FontFamily="Courier"
              Margin="20,0,0,0"
              Text="{Binding ElementName='GradientStop1', Path='Offset',
                Converter='{StaticResource DoubleToStringConverterResource}'}" />

            <!-- Gradient Stop 2 -->
            <TextBlock 
               Style="{StaticResource EntryLabelStyle}"
               Grid.Column="0" Grid.Row="2" 
               FontWeight="Bold"
               Margin="0,0,20,0"
               Text="Stop 2" />

            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="1" Grid.Row="2" 
              Text="Color:" />

            <TextBox
              Grid.Column="2" Grid.Row="2" 
              Text="{Binding ElementName='GradientStop2', Path='Color'}" />

            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="4" Grid.Row="2" 
              Text="Offset:" />

            <Slider
              Grid.Column="5" Grid.Row="2" 
              Minimum="0" Maximum="1" 
              Width="100" 
              Value="{Binding ElementName='GradientStop2', Path='Offset'}" />

            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="6" Grid.Row="2" 
              FontFamily="Courier"
              Margin="20,0,0,0"
              Text="{Binding ElementName='GradientStop2', Path='Offset',
                  Converter='{StaticResource DoubleToStringConverterResource}'}" />

            <!-- Gradient Stop 3 -->
            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="0" Grid.Row="4" 
              FontWeight="Bold"
              Margin="0,0,20,0"
              Text="Stop 3" />

            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="1" Grid.Row="4" 
              Text="Color:" />

            <TextBox
              Grid.Column="2" Grid.Row="4" 
              Text="{Binding ElementName='GradientStop3', Path='Color'}" />

            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="4" Grid.Row="4" 
              Text="Offset:" />

            <Slider
              Grid.Column="5" Grid.Row="4" 
              Minimum="0" Maximum="1" 
              Width="100" 
              Value="{Binding ElementName='GradientStop3', Path='Offset'}" />

            <TextBlock 
              Style="{StaticResource EntryLabelStyle}"
              Grid.Column="6" Grid.Row="4" 
              FontFamily="Courier"
              Margin="20,0,0,0"
              Text="{Binding ElementName='GradientStop3', 
              Path='Offset',
              Converter='{StaticResource DoubleToStringConverterResource}'}" />
          </Grid>
        </Border>
      </StackPanel>
    </Border>

    <!-- Displays markup that describes the brush. -->
    <Expander Header="Markup" DockPanel.Dock="Top" Margin="0,10,0,0"
      BorderBrush="Black" BorderThickness="1" >
      <Border Background="LightGray" 
        BorderBrush="Gray" BorderThickness="1" 
        Padding="5">
        <TextBlock Name="markupOutputTextBlock" FontFamily="Courier" />
      </Border>
    </Expander>

    
    <Border Name="GradientDisplayElement" 
      SizeChanged="gradientDisplaySizeChanged"
      MouseLeftButtonDown="gradientDisplayMouseLeftButtonDown"
      MouseLeftButtonUp="gradientDisplayMouseLeftButtonUp"
      MouseMove="gradientDisplayMouseMove"
      Margin="20"
      Height="200" Width="400">
      <Border.Background>
        <LinearGradientBrush 
          x:Name="InteractiveLinearGradientBrush"
          Changed="onInteractiveLinearGradientBrushChanged">
          <GradientStop x:Name="GradientStop1" Offset="0" Color="Blue" />
          <GradientStop x:Name="GradientStop2" Offset="0.5" Color="Purple" />
          <GradientStop x:Name="GradientStop3" Offset="1" Color="Red" />
        </LinearGradientBrush>
      </Border.Background>

      <Canvas  
        HorizontalAlignment="Stretch" VerticalAlignment="Stretch">

        <Line
          Stroke="Black" StrokeThickness="3"
          StrokeDashArray="2,1"
          X1="{Binding ElementName=StartPointMarkerTranslateTransform, Path=X}"
          Y1="{Binding ElementName=StartPointMarkerTranslateTransform, Path=Y}"
          X2="{Binding ElementName=EndPointMarkerTranslateTransform, Path=X}"
          Y2="{Binding ElementName=EndPointMarkerTranslateTransform, Path=Y}">
        </Line>

        <!-- Marks the brush's StartPoint. -->
        <Ellipse
          Name="StartPointMarker"
          Style="{StaticResource MarkerEllipseStyle}"
          Canvas.Left="-10" Canvas.Top="-10">
          <Ellipse.RenderTransform>
            <TranslateTransform 
              x:Name="StartPointMarkerTranslateTransform"
              X="0" Y="0" />
          </Ellipse.RenderTransform>
        </Ellipse>

        <!-- Marks the brush's EndPointPoint. -->
        <Ellipse
          Name="EndPointMarker"
          Style="{StaticResource MarkerEllipseStyle}"
          Canvas.Left="-10" Canvas.Top="-10">
          <Ellipse.RenderTransform>
            <TranslateTransform 
              x:Name="EndPointMarkerTranslateTransform"
              X="0" Y="0" />
          </Ellipse.RenderTransform>
        </Ellipse>

        <!-- Labels the StartPoint marker. -->
        <Label Content="StartPoint">
          <Label.RenderTransform>
            <TranslateTransform
              X="{Binding ElementName=StartPointMarkerTranslateTransform, Path=X}"
              Y="{Binding ElementName=StartPointMarkerTranslateTransform, Path=Y}" />
          </Label.RenderTransform>
        </Label>

        <!-- Labels the EndPoint marker. -->
        <Label Content="EndPoint">
          <Label.RenderTransform>
            <TranslateTransform
              X="{Binding ElementName=EndPointMarkerTranslateTransform, Path=X}"
              Y="{Binding ElementName=EndPointMarkerTranslateTransform, Path=Y}" />
          </Label.RenderTransform>
        </Label>
      </Canvas>
    </Border>
  </DockPanel>
</Page>

